MacBook Air and Seagate 3TB not working properly since Yosemite

Hey all, I'm stuck all of a sudden so I'm hoping someone can help.
I have a mid 2012 MacBook Air (1.8GHz i5, 4gb DDR3 Ram) and a Seagate 3TB external hard drive (model SRD0SD1). I've never had a problem with either of these units. I upgraded to Yosemite the other day but tonight was the first time I've really used my computer since then. I went to back up some photos/video from my iPhone to the drive, and during the transfer I got a warning about not properly ejecting the disk. I checked the connections thinking the USB may have come lose, but everything seemed fine. I plugged it back in and could only see the folders, no file. I restarted the computer and could see everything fine, which is awesome, however now I cannot write to the disk at all. I get an error saying, "OS X can't repair the disk Seagate. You can still open or copy files on the disk, but you can't save changes to files on the disk. Backup the disk and reformat it as soon as you can"
I tried repairing the disk in Disk Utility anyways, but I wasn't shocked when it didn't work. A friend of mine works in IT for a university and said this has been popping up a lot the past week or so. Does anyone have any insight/recommendations as to what to do next? I'd rather not replace the drive, it's less than 2 years old!
Thanks in advance for the help, it's much appreciated.

Seagate problems here too..
with a macbook pro 15 late 2013
Since the upgrade to Yosemite it does not read my 1 tb Seagate.
Icon does show on desktop, but finder wont open it.
I tried connecting the drive to an other mac and it works fine.
Other 3.0 usb devices work fine on the macbook.
So it seems to be a seagate-specific issue.

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